package com.sfang.common.util.json;

import com.google.gson.Gson;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

/**
 * Created by sh01214 on 2017/12/6.
 */
public class JSONUtil {

    private static Logger LOGGER = LoggerFactory.getLogger(JSONUtil.class);
    /**
     * List转成Json
     *
     * @param list
     * @return
     */
    public static String listToJson(List<?> list) {
        StringBuilder json = new StringBuilder();
        json.append("[");
        if (list != null && list.size() > 0) {
            for (Object obj : list) {
                json.append(objectToJson(obj));
                json.append(",");
            }
            json.setCharAt(json.length() - 1, ']');
        } else {
            json.append("]");
        }
        return json.toString();
    }

    /**
     * map 转成  map
     *
     * @param map
     * @return
     */
    public static Map<String, String> convertMap(Map<String, Object> map) {
        Map<String, String> resultMap = new HashMap<String, String>();
        if (!map.isEmpty() || map.size() > 0) {
            Iterator<Entry<String, Object>> iter = map.entrySet().iterator();
            while (iter.hasNext()) {
                Entry<?, ?> e = (Entry<?, ?>) iter.next();
                resultMap.put(e.getKey().toString(), e.getValue().toString());
            }
        }
        return resultMap;
    }

    public static String objectToJson(Object object) {
        StringBuilder json = new StringBuilder();
        if (object == null) {
            json.append("\"\"");
        } else if (object instanceof String || object instanceof Integer) {
            json.append("\"").append(object.toString()).append("\"");
        } else {
            json.append(beanToJson(object));
        }
        return json.toString();
    }

    public static String beanToJson(Object bean) {
        return (new Gson()).toJson(bean);
    }

    public static String beanToJsonb(Object bean) {
        StringBuilder json = new StringBuilder();
        json.append("{");
        PropertyDescriptor[] props = null;
        try {
            props = Introspector.getBeanInfo(bean.getClass(), Object.class)
                    .getPropertyDescriptors();
        } catch (IntrospectionException e) {
        }
        if (props != null) {
            for (int i = 0; i < props.length; i++) {
                try {
                    String name = objectToJson(props[i].getName());
                    String value = objectToJson(props[i].getReadMethod().invoke(bean));
                    json.append(name);
                    json.append(":");
                    json.append(value);
                    json.append(",");
                } catch (Exception e) {
                }
            }
            json.setCharAt(json.length() - 1, '}');
        } else {
            json.append("}");
        }
        return json.toString();
    }

    /**
     * json 转 map
     *
     * @param json
     * @return
     */
    public static Map<String, String> json2map(String json) {
       return null;
    }
}

